Coil retaining means



Dec. 13, 1932. EATON 1.35 3 2%?) COIL RETAINING MEANS Original Filed May 14, 1928 afiomig 5 Fatented Dec. 13, 1932 UNITED STATES PATENT OFFICE HARRISON H. EATON, OF TOLEDO, OHIO, ASSIGNOR TO THE ELECTRIC AUTO-LITE COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO COIL RETAINING MEANS Original application filed Kay 14, 1928, Serial No. 277,648. Divided and this application filed larch 88, 1930. Serial No. 439,810.

This invention relates to a method of and means for securing coils in armatures or the like, and is a division of my application for coil retaining means, Serial No. 277,648, filed May 14, 1928. In the manufacture of armatures for use in motors and other dynamo electric machines. and particularly of the smaller sizes, the armatures are formed with a plurality of circumferentially spaced grooves or recesses, the latter having narrow throats which are ada ted to receive a number of turns of wire orming the armature coils. Various means have heretofore been wood or fiber, strips 0 insulating paper, etcetera, but these methods of retaining the coils are somewhat unsatisfactory and in.

those structures in which wedges are used, the operation of inserting them consumes a great deal of time and is comparatively expensive. One of the principal objects of this invention is the provision of a novel method of retaining coils in armature recesses.

Another object of the invention is the provision of a means for retaining armature coils which consists in positioning a length of fibrous rope in the throat of-the armature slot.

Further objects and advantages are within the scope of this invention such as relate to the arrangement, operation and function of the related elements of the structure, to various details of construction and to combinations of parts, elements per se, and to economies of manufacture and numerous other features as will be apparent from a consideration of the specification and drawing of a form of the invention, which may be preferred, in. which:

Figure 1 is an elevational view of an armature embodying my invention;

Figure 2 is a transverse sectional view taken substantially on the line 22 of Figure 1;

Figure 3 is a partly diagrammatic View showing a portion of an armature recess in the position of the coil retaining strip prior to its insertion in the recess;

Figure 4 is a view similar to Figure 3 illustrating a-coil retaining strip as entering the throat of the armature recess;

F i ure'5 is a View similar to Figure 3 showing t e position of the retaining strip in the armature recess before the withdrawal of the inserting tool;

Fi ure 6 is a view similar to Figure 5 showing the form assumed by the retaining strilp after the withdrawal of the inserting too Referring particularly to the drawing in carrying out the idea of my invention, the coil retaining means 1 for'retaining the coils 3 in the armature 5 is preferably an insulating material having resilient characteristics as, for example, rope or other fibrous material. Portions of the rope are selectively fed opposite the throats of the several armature recesses and as each recess is brought to predetermined position, a tool 6 automatically inserts a length of the rope therein. The coil retaining rope I is preferably of a diameter slightly larger than the width of the opening or. throat of an armature recess so that upon being forced into the recess by means of the tool 6, the rope is distorted as shown in Figure 4 in entering the throat.

After the rope has been pushed through the throat of an armature recess 4 a continued downward movement of the inserting tool 6 causes the rope to compressthe coils in the recess as shown in Figure 5. Upon withdrawal .of the tool 6, the reaction of the coil is sufiicient to bind the rope firmly between the coils and the adjacent walls of the recess, the rope assuming somewhat of an oval shape as shown in Figure 6, so that there is no danger of the rope being forced out through the throat and at the same time secures the coil against-displacement.

The paper insulation A covering the teeth of the armature makes the insertion of the rope easier as the sharp es of the teeth are notpermitted tocontact with the coil retaining ropes. r

also contemplate the use of coil retaining material of a dimension substantially equiv-' alent to or less than that of the opening of the armature recess, the material being caused to expand laterally under the pressure of the inserting tool after it has been placed in the recess and under the influence of the coil reaction, is caused to engage the side walls thereof and prevent displacement of the coils.

It is apparent that, within the scope of the invention modifications and difierent arran ements may be made other than is herein disc osed, and the present disclosure is illustrative merely, the invention comprehending all variations thereof.

What I claim is:

1. The combination with an armature having longitudinally extending recesses having throats narrower than the recesses, of coils in said recesses and fibrous rope extending full length of said recesses and arranged to lie between the coils and the walls of throats of the recesses thereby closing the throats throughout their full length.

2. The combination with an armature having recesses with peripheral throats narrower than the recesses, of coils in said recesses and sections of twisted material of substantially circular cross section extending full length of said throats and arranged to lie between the coils and the walls of the throats thereby sealing the latter throughout their full length.

3. The combination with an armature having longitudinally extending recesses lined with insulating material, said recesses having throats narrower than the recesses, of coils in said recesses and retaining means for said coils comprising a fibrous rope extending in said recesses and arranged to lie between the coils and the insulated walls of the throats of the recesses.

4. The combination with an armature having recesses with peripheral throats narrower than the recesses, said recesses being lined with insulating material, of coils in said recesses and sections of twisted material of substantially circular cross section extending in said throats and adapted to hold said coils in said recesses by closing the throats thereof.

5. The combination with an armature having recesses with peripheral throats narrower than the recesses, said recesses being lined with thin, flexible sheet insulation, of coils in said recesses and sections of twisted material of substantially circular cross section extending full length of said throats and adapted to hold said coils in said recesses by closing the throats thereof.

In testimony whereof, I afiix my signature.

HARRISON H. EATON. 

